Malicious PDF — malware analysis report

Static analysis result for SHA-256 638fabd7d3af05fd…

MALICIOUS

PDF

80.2 KB Created: 2021-07-21 19:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 425462f699d692f05cd732f075f3e9be SHA-1: be179ead1c3516b2b860f05f7a6796dd875182b2 SHA-256: 638fabd7d3af05fd7fa5b964e38243e97d92041840f3c20389737a897dc9f64c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external links, many on potentially compromised or disposable hosting, strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/890feaf46829875480b7db2c69a62e9e/31892632244.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce0761849---20377866128.pdfIn PDF document text
    • https://luminex.pl/upload/file/noxugagiwujopusatarivav.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b91f7580553---bowosimepaxuza.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/70093484701.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/83690956441.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36924bdae---31634588579.pdfIn PDF document text
    • http://jar-ted.pl/file/50443882206.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/77520517075.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1sn30rqgfabdtgjpq30lvvv2md/dololasitimi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b4758486---3596533842.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/fuperufoxiloniwed.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/45613472713.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2dfa3a42a---kigijuvoferoraruka.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/66060371897.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210706090355.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/779670f3187e4c3ad4927c59231c422f/lifubimes.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bimuzabemevubavagugijexeg.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f90be54e88---25159504686.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/278nhrkqtq4ngtibref5936e3s/gofawuwizoragulejonani.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///2295889287.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092610ea4c67---86011663020.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/nawezuluxasova.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8167dda7be---84738562646.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sufixamawirepududezarefaw.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/mosidusug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ml+to+cm3+conversionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 17476 bytes
SHA-256: d57cad2ab1266e099e6664108d68fe88f3d64e20904f13b3af938821e2b4faf5
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 10460 bytes
SHA-256: 41191b61dffbcf6858ac724c28e82b1ce059540f162c691174b08a93bb7844f9

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